Coating composition for layer having low refractive index, and transparent conductive film including same

Abstract

Provided is a coating composition for a layer having a low refractive index and comprising a siloxane compound and a metal salt. In addition, provided is a transparent conductive film including the layer having a low refractive index and formed by using the coating composition for a layer having a low refractive index.

1 . A coating composition for a low refractive-index layer comprising: a siloxane compound; and a metal salt. 
     
     
         2 . The coating composition according to  claim 1 , wherein the metal salt comprises a salt of at least one metal selected from the group consisting of zinc, yttrium, trivalent chromium, di- and trivalent cobalt, nickel, magnesium, aluminum, mono- and divalent copper, trivalent iron, cadmium, antimony, mercury, rubidium, vanadium, and combinations thereof. 
     
     
         3 . The coating composition according to  claim 1 , wherein the metal salt comprises at least one salt selected from the group consisting of nitrates, sulfates, carboxylates, halides, alkoxides, acetyl acetonate, and combinations thereof. 
     
     
         4 . The coating composition according to  claim 1 , wherein the metal salt is present in an amount of 0.1 wt % to 1.0 wt % based on the total weight (100 wt %) of the coating composition. 
     
     
         5 . The coating composition according to  claim 1 , wherein the siloxane compound comprises a siloxane polymer selected from the group consisting of tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, glycidyloxypropyltrimethoxysilane, and combinations thereof. 
     
     
         6 . The coating composition according to  claim 5 , wherein the siloxane polymer has a molecular weight of about 1,000 to about 50,000. 
     
     
         7 . The coating composition according to  claim 1 , wherein the siloxane compound is present in an amount of 5 wt % to 100 wt % based on the total weight (100 wt %) of the coating composition. 
     
     
         8 . A transparent conductive film comprising: a low refractive-index layer formed using the coating composition for a low refractive-index layer according to  claim 1 . 
     
     
         9 . The transparent conductive film according to  claim 8 , wherein the transparent conductive film has a laminate structure of a transparent substrate, a high refractive-index layer, the low refractive-index layer, and a conductive layer. 
     
     
         10 . The transparent conductive film according to  claim 8 , wherein the low refractive-index layer has an index of refraction of 1.4 to 1.5. 
     
     
         11 . The transparent conductive film according to  claim 8 , wherein the low refractive-index layer has a thickness of 5 nm to 100 nm. 
     
     
         12 . The transparent conductive film according to  claim 9 , wherein the high refractive-index layer has a thickness of 20 nm to 150 nm. 
     
     
         13 . The transparent conductive film according to  claim 9 , wherein the transparent substrate is a monolayer or multilayer film comprising any one selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), polypropylene (PP), polyvinyl chloride (PVC), polyethylene (PE), polymethyl methacrylate (PMMA), ethylene vinyl alcohol (EVA), polyvinyl alcohol (PVA), and combinations thereof. 
     
     
         14 . The transparent conductive film according to  claim 9 , wherein the conductive layer comprises indium tin oxide (ITO) or fluorine-doped tin oxide (FTO). 
     
     
         15 . The transparent conductive film according to  claim 9 , further comprising: a hard coating layer on one or both surfaces of the transparent substrate.